How to force classes to implement the same method from parent class?

Question

PHP

Good afternoon!
Let's say there are three classes. One parent and two children.
Example

class Parent
{
    public function getName()
    {
        return "Родитель";
    }
}

class Child1 extends Parent
{
    public function getName()
    {
        return "Дочерний 1";
    }
}

class Child2 extends Parent
{
    public function getName()
    {
        return "Дочерний 2";
    }
}

It is necessary that each newly created child class implements one method, let's say getName(). Moreover, the main condition is that the child class must not implement any interface and the parent class must have the same getName () method as the child ones.
It should turn out like this:

echo $parent->getName();
echo $child1->getName();
echo $child2->getName();

// Родитель
// Дочерний 1
// Дочерний 2

Answer 1

<?php

class p {
  
  public $name = 'p';
  
  function getname(){
    return $this->name;	
  }
}

class c1 extends p {
  public $name = 'c1';	
}
class c2 extends p {
  public $name = 'c2';	
}

$p = new p;
$c1 = new c1;
$c2 = new c2;
echo $p->getname();
echo $c1->getname();
echo $c2->getname();

//pc1c2

Answer 2

Hello.
Can't you make the parent abstract too?
For example:

abstract class Parent
{
    abstract public function getName()
    {
        return "Родитель";
    }
}

class Child1 extends Parent
{
    public function getName()
    {
        return "Дочерний 1";
    }
}

class Child2 extends Parent
{
    public function getName()
    {
        return "Дочерний 2";
    }
}

Answer 3

Can traits be used ?